International Society for Prosthetics and Orthotics
ISPO is an organisation that offers information about prosthetics and orthotics and physical rehabilitation.

Journal of Prosthetics and Orthotics 
JPO online library that contains issues back to 1989.

Orthopädie Technik Forum
A very comprehensive German site of orthotics and prosthetics
The global resource for orthotics and prosthetics information.

International Cerebral Palsy Society
ICPS is an international orginisation providing knowledge of CP. ICPS promotes development and research on understanding CP.